Clamp for cutters or bits of cutter-machines.



B. T. MORRIS. CLAMP POP. OUTTERS 0R BITS OF GUTTER MACHINES;

APPLICATION IILED- MAR. 10, 1906.

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EPATENTED MAR. 19, 1907.

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EMERSON T. MORRIS, OF DERWENT, OHIO.

CLAMP FOR CUTTERS OR BITS O F CUTTER-MACHINES. i

Specification of Letters Patent.

Patented March 19, 1907.

Application filed March 10,1906. Serial No. 305,385.

To all whom it may concern.-

Be it known that I, EMERSON T. Mortars, a citizen of the United States, residing at Derwent, in the county of Guernsey and State of Ohio, have invented certain new and useful Improvements in Clamps for Cutters or Bits of Cutter-Machines, of which the following is a specification.

This invention consists of novel means for clamping or attaching bits or cutters such as used on large cutting-machines for operating on stone, coal, or similar hard substances to the holders to which the cutters are customarily applied.

The invention is designed as an effective substitute for the ordinary set-screw usually provided to hold the cutters or bits in place, said set-screw being disadvantageous for various reasons obvious to those cognizant with the art to which this invention appertains.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for effecting ,the result reference is to be had to the following description and accompanying drawings, in which- Figure 1 is a longitudinal vertical sectional view of a bit-holder, showing the clamping means comprising the invention applied thereto. Fig. 2 is a horizontal section taken about on the line X X of Fig. 1. Fig. 3 is a transverse section taken on the line Y Y of Fig. 1, but including a modification in the form of the holder. Fig. 4 is a detail perspective view of the clamping device. Fig. 5 is a detail perspective view of the adjustingstem and nut used to coact with the clamp member.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Specifically describing the invention, the numeral 1 designates the cutter or bit holder, which is customarily called a lug and a number of which are used on cutting-machines to hold the several bits or cutters which act upon the coal or hard substance which is being cut or reduced by means of the cutting-machine. The holder 1 comprises a suitable body provided with a socket 2 to receive the cutter 3, which cutter is of usual form embodying a suitable tang or body and a cutting edge at one end. The

i right angle.

cutter 3 is prevented from displacement by means of a clamp member 4, which comprises a body having spaced lugs 5 projecting therefrom and extending into an opening 4,

formed in the body of the holder 1 and inter-- secting the socket 2 at approximately a The outer extremities of the I lugs 5 are provided with a series of transverse ribs which are disposed at right angles to the axis of the tang of the cutter 3 and have a positive engagement therewith which holds the cutter securely against slipping out of position. The clamp member 4 is actuated by means of a threaded stem 6 and nut 7, adjustable thereon. The stem 6 is provided at its innermost end with a head 8, which may be of somewhat rectangular form, so that it may be readily passed into the opening 4 which is in cross-section of a somewhat similar form. The head 8 is adapted to be turned after it has been passed into the opening 4, so that opposite ends of said head are seated in laterally-extending openings 9, formed transversely of the body of the holder 1. The openings 9 form lateral seats extending from the opening 4 near the innermost extremity of the latter, and the end portions of the head 8 have a bearing against the outer sides of said seats or openings 9 when the nut 7 is so adjusted as to bear against the body of the clamp member 4 to cause engagement of the lugs 5 of said clamp member with the cutter 3.

The stem 6 passes through an opening in the body of the clamp member 4, as shown most clearly in the drawings, and in the practical embodiment or use of the invention, the cutter 3 having been placed in the socket 2, the stem 6 will be introduced into the opening 4 and turned so that the head 8 thereof has a suitable bearing with regard to the seats or the lateral openings 9. The clamp member 4 is then arranged so that, its lugs 5 bear against the bit or cutter 3, and the nut 7 is screwed upon the stem 6 and hard against the body of the clamp member 4 until the transversely-disposed ribs at the ends of the lugs 5 positively engage the cutter and effectively prevent displacement or movement thereof in any way.

By use of the invention the objectionable set-screw is eliminated, and this is of material importance in that when said set-screw is used for the holders 1 the threaded openings of the holders become stripped of the threads,

tangular shape making it necessary to discard the whole, member 1, which gives rise to considerable expense and is possessed of other disadvanta'es. The clamp device above described wi 1 also prevent the bit or cutter from being moved into a position in which it is uneven with respect to the other cutters, and thus subjected to abnormal'conditions of service. However, should the cutter by any possibility get out of adjustment the clamp means therefor will be more effective than is the common form of set-screw device.

Fig. 3 illustrates a modification of the in; vention in which the opening 4 is provided near its upper and lower portion and at its opposite sides with longitudinal grooves forming guides for the lugs 5 and obviating likelihood of binding of the clamp member with reference to the stem 6, adjacent to which it moves longitudinally.

It is to be particularly noted that the head of the threaded stem 6 is of the same recand' width as the lateral slots or openings 9 and has a plane front face and that the said lateral openings lie entirely without the plane of the socket 2. Hence even though the bit or cutter 3 should become loose it can never strike or mutilate the head 8. Furthermore, the snug fit of the ends of the head 8 in the lateral openings 9 tends to hold the stem 6 and the head 8 solidly in the body 1 and serves to produce a rigid structure when the bars are clamped against a bit, while at the same time it asslsts to some degree in making easy the application of the nut 7 beyond the clamp to bind the same a ainst the bit.

Having thus described the invention, what is claimed as new is- The herein-described improved bit-holder, comprising a body formed with a bit-receiving socket, a clamp-receiving opening perpendicular to said socket, and oppositely-extending lateral openings leading from said clamp-receiving opening, the innermost walls of said lateral openings lying outside the plane of the adjacent wall of the said socket, a threaded stem having a rectangular head with a plane outer face, said head being designed to pass through the clamp-receiving opening and to have its end portions enter the lateral openings upon giving the stem a quarter-turn, said head being of a width equal to said openings, whereby it will snugly fit the same and be held solidly, but removably, in the body, always free from contact with the bit in the socket, a U-shape clamp slidable upon said stem with its legs embracing the latter and designed to project into the socket whereby to impinge against a bit mounted therein, and a nut upon said stem beyond the clamp, as and for the purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

EMERSON T. MORRIS. Vitnesses U. W. KING, R. P. KING. 

